The series' seventh season began airing September 23, 2008, on a new 10:00 pm (EST) Tuesday timeslot. Steven Weber joined the cast for the first five episodes of the season as Special Agent Clark Medina, Jack's temporary replacement as unit supervisor. The episodes focused as much on missing persons cases as on Medina's war against Jack, as he revealed that he had not only been..(艺术本来是弥补人生和自然的缺陷的，一切美的事物，都需要我们自己去发现和经营。)